The AI is multiple programs working together, and they already pass math problems on to a data analyst specialist. There's also an option to use a WolframAlpha plugin to handle math problems.

The reason it didn't have math from the start was that it was a solved problem on computers decades ago, and they are specifically demonstrating advances in language capabilities.

Machines can handle math, language, graphics, and motor coordination already. A unified interface to coordinate all of those isn't finished, but gluing together different programs isn't a significant engineering problem.